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-rw-r--r--include/linux/hid.h28
-rw-r--r--include/uapi/linux/input-event-codes.h18
2 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h
index d44a78362942..2827b87590d8 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -1139,6 +1139,34 @@ static inline u32 hid_report_len(struct hid_report *report)
int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size,
int interrupt);
+
+/**
+ * struct hid_scroll_counter - Utility class for processing high-resolution
+ * scroll events.
+ * @dev: the input device for which events should be reported.
+ * @microns_per_hi_res_unit: the amount moved by the user's finger for each
+ * high-resolution unit reported by the mouse, in
+ * microns.
+ * @resolution_multiplier: the wheel's resolution in high-resolution mode as a
+ * multiple of its lower resolution. For example, if
+ * moving the wheel by one "notch" would result in a
+ * value of 1 in low-resolution mode but 8 in
+ * high-resolution, the multiplier is 8.
+ * @remainder: counts the number of high-resolution units moved since the last
+ * low-resolution event (REL_WHEEL or REL_HWHEEL) was sent. Should
+ * only be used by class methods.
+ */
+struct hid_scroll_counter {
+ struct input_dev *dev;
+ int microns_per_hi_res_unit;
+ int resolution_multiplier;
+
+ int remainder;
+};
+
+void hid_scroll_counter_handle_scroll(struct hid_scroll_counter *counter,
+ int hi_res_value);
+
/* HID quirks API */
unsigned long hid_lookup_quirk(const struct hid_device *hdev);
int hid_quirks_init(char **quirks_param, __u16 bus, int count);
diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
index 53fbae27b280..6d180cc60a5d 100644
--- a/include/uapi/linux/input-event-codes.h
+++ b/include/uapi/linux/input-event-codes.h
@@ -708,6 +708,15 @@
#define REL_DIAL 0x07
#define REL_WHEEL 0x08
#define REL_MISC 0x09
+/*
+ * 0x0a is reserved and should not be used in input drivers.
+ * It was used by HID as REL_MISC+1 and userspace needs to detect if
+ * the next REL_* event is correct or is just REL_MISC + n.
+ * We define here REL_RESERVED so userspace can rely on it and detect
+ * the situation described above.
+ */
+#define REL_RESERVED 0x0a
+#define REL_WHEEL_HI_RES 0x0b
#define REL_MAX 0x0f
#define REL_CNT (REL_MAX+1)
@@ -744,6 +753,15 @@
#define ABS_MISC 0x28
+/*
+ * 0x2e is reserved and should not be used in input drivers.
+ * It was used by HID as ABS_MISC+6 and userspace needs to detect if
+ * the next ABS_* event is correct or is just ABS_MISC + n.
+ * We define here ABS_RESERVED so userspace can rely on it and detect
+ * the situation described above.
+ */
+#define ABS_RESERVED 0x2e
+
#define ABS_MT_SLOT 0x2f /* MT slot being modified */
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */